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Employee Benefit Plans (Pension Benefit Plan) - Schedule of Pension Benefit Plan Obligations and Funded Status (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Change in projected benefit obligation:      
Projected benefit obligation at beginning of period $ 34,893 $ 30,011  
Service cost 1,193 1,260 $ 1,211
Interest cost 727 607 720
Actuarial loss - experience 38 47  
Actuarial (gain) loss - assumptions 2,139 (1,294)  
Benefit payments (138) (80)  
Effects of foreign currency exchange rate changes (1,615) 4,342  
Projected benefit obligation at end of period 37,237 34,893 30,011
Change in plan assets:      
Fair value of plan assets at beginning of period 26,624 20,045  
Actual return (loss) on plan assets (2,024) 709  
Contributions 688 3,001  
Effects of foreign currency exchange rate changes (1,129) 2,869  
Fair value of plan assets at end of period 24,159 26,624 $ 20,045
Unfunded status at end of period $ (13,078) $ (8,269)